Dhobhi Bhai, I'm taking them before I really started with the exercise. I take them even when I do "cardio stuff" like tennis, football (soccer) or squash. Is It adviceable? I feel like I have lost 2 kgs since I do more cardio and well I hardly put on fat while taking Nitrix. I will keep on taking It for the next 10 days. I feel no side effects, on the contrary I feel great with nitrix and I noticed more hardness in my biceps. It's great! I have also started drinking 3 l a day.
How often are you taking protein shakes, are you also taking them during the cardio days or high-activity days that you stated? If you are taking protein shakes, then yes, by all means, maximize the strength and give your muscles a boost by Nitrix. Others might advise to take it only during weight-training days, and that is also a recommended advice. Get in the habit of drinking protein shakes everyday, however much you usually drink it, and take Nitrix also during those days (but no Nitrix on the days when you don't weight-train or when you not drink your protein. It will be wasted).
I am glad you are feeling great, it is supposed to give you hardness in your biceps and a pop in veins. You will feel it especially on your upper-body workout days. Great to know it is working out well for you.
When do you eat your next snack/meal after you take the 3 pills? Are you following 3x3 routine, or a different routine, since you are in the building phase?